Announcement from the VATSIM homepage:
VATSIM has recently instructed the development teams for our X-Plane clients, (xSquawkbox, xPilot, and swift), to add code which will automatically disconnect users who are unable to maintain an average of 20 frames per second while connected to VATSIM. ...
https://www.vatsim.net/news/importan...-x-plane-users
